Efficient second-harmonic generation for generating ultrafast blue light in periodically-poled bulk and waveguide potassium titanyl phosphate

We report the first results of SHG in short-period periodically-poled KTiOPO/sub 4/ (KTP) for efficiently generating blue light using subpicosecond laser pulses. The uniqueness of our results lies in the combination of short-period periodically-poled KTP crystals and an ultrafast pump beam for efficient generation of blue light.